diff --git a/lib/ui/widgets/group_member_list.dart b/lib/ui/widgets/group_member_list.dart
index 48a9582..8894216 100644
--- a/lib/ui/widgets/group_member_list.dart
+++ b/lib/ui/widgets/group_member_list.dart
@@ -146,10 +146,18 @@ class _GroupProfileMemberListState extends TIMUIKitState<GroupProfileMemberList>
                         child: CheckBoxButton(
                             onChanged: (isChecked) {
                               if (isChecked) {
-                                if (widget.maxSelectNum != null && selectedMemberList.length >= widget.maxSelectNum!) {
-                                  return;
+                                // When single-select, directly replace the previous selection
+                                if (widget.maxSelectNum != null && widget.maxSelectNum == 1) {
+                                  selectedMemberList
+                                      .removeWhere((element) => element.userID != memberInfo.userID);
+                                  // Ensure only the new member remains
+                                  selectedMemberList = [memberInfo];
+                                } else {
+                                  if (widget.maxSelectNum != null && selectedMemberList.length >= widget.maxSelectNum!) {
+                                    return;
+                                  }
+                                  selectedMemberList.add(memberInfo);
                                 }
-                                selectedMemberList.add(memberInfo);
                               } else {
                                 selectedMemberList.removeWhere((element) => element.userID == memberInfo.userID);
                               }
@@ -211,14 +219,21 @@ class _GroupProfileMemberListState extends TIMUIKitState<GroupProfileMemberList>
                     widget.onTapMemberItem!(memberInfo, null);
                   }
                   if (widget.canSelectMember) {
-                    final isChecked = selectedMemberList.contains(memberInfo);
+                    final isChecked =
+                        selectedMemberList.any((element) => element.userID == memberInfo.userID);
                     if (isChecked) {
-                      selectedMemberList.remove(memberInfo);
+                      selectedMemberList
+                          .removeWhere((element) => element.userID == memberInfo.userID);
                     } else {
-                      if (widget.maxSelectNum != null && selectedMemberList.length >= widget.maxSelectNum!) {
-                        return;
+                      // When single-select, directly replace the previous selection with the new one
+                      if (widget.maxSelectNum != null && widget.maxSelectNum == 1) {
+                        selectedMemberList = [memberInfo];
+                      } else {
+                        if (widget.maxSelectNum != null && selectedMemberList.length >= widget.maxSelectNum!) {
+                          return;
+                        }
+                        selectedMemberList.add(memberInfo);
                       }
-                      selectedMemberList.add(memberInfo);
                     }
                     if (widget.onSelectedMemberChange != null) {
                       widget.onSelectedMemberChange!(selectedMemberList);